AMP:37 Location: S-509 and Valley Rd, Beaverhead Cty S-509 begins here, on the east edge of the Red Rocks National Wildlife Refuge. It’s a 37 1/2 mile trek down a washboarded dirt road from here to Monida. AMP: 30 Location: S-509 and nothing, Beaverhead Cty This is a pretty desolate road, so desolate that I … Continue reading Montana Secondary Highway 509, Red Rock NWR to I-15